Driver for grinding-mills.



PATENTBD JULY 17, 1906. J. L., J. 0. & W. M. BROWN.

DRIVER FOR GRINDING MILLS. APPLICATION FILED 00118, 1905.

1 745p er 6? B Pawn Mhtmmo WLLZiQJTL flLBr'o wn I 1 5)?! l3 W WW n4: NORRIS Pzrsxs cD-. WAsHlNcroN. o. c.

UNITED STATES PATENT orrion.

JOHN L. BROWVN, OF LAGON, AND J ASPER C. BROWN AND W'ILLIAM M.

BROWN, OF VINEMONT, ALABAMA.

DRIVER FOR GRINDING-MILLS.

Specification of Letters Patent.

Eatented July 17, 1906.

Application filed October 18. 1905. Serial No. 283,309.

To all whom, it may concern.-

Be it known that we, JOHN L.'BROWN, residing at Lacon, Morgan county, and JASPER C. BROWN and WILLIAM M. BROWN, residing at Vinemont, Cullman county, Alabama, citizens of the United States, have invented certain new and useful Improvements in Drivers for Grinding-Mills, of which the following is a specification.

In grinding-mills embodying a run of stones the best results are obtained both as to economy in the operation of the mill and in the product when the mill is in tram and the runner moves without rake or chuckle. The rigid driver does not always have its horns strike the walls of the coffins with equal force, and as a result the runner is caused to rake or chuckle and produce bad effects on the work and on the run ofstones and necessitating extra power.

This invention provides a driver which is self-adjusting to the cofiins, so that its horns will bear with like force against the walls thereof and obviate throwing the runner or mill out of balance.

For a full description of the invention and the merits thereof and also to acquire a knowledge of the details of construction of the means for effecting the result reference is to be had to the following description and accompanyingdrawings.

While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment is shown in the accompanying drawings, in which Figure 1 is a vertical central section of a mill of the type embodying the run of stones provided with a driver constructed in accordance with this invention. Fig. 2 is a face view of the runner, showing the operation of the improved driver, a part of the frame of the latter being omitted. Fig. 3 is a detail perspective view of the driver on a larger scale, the parts being separated and ar ranged in a group. Fig. 4 is a detail longitudinal section of the driver, end portions being broken away, showing the upper end portion of the mill-spindle. Fig. 5 is a central transverse section of the parts shown in Fig. 4, the mill-spindle being in full lines.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The grinding-mill illustrated is of the type embodying a run of stones, the bed-stone 1 and the runner 2 being mounted with reference to each other and to the spindle 3 and hoop 4 in the accustomed manner. The driver is of sectional formation and comprises a frame 4 and pivoted members 5, the latter articulating at their inner ends and having pivotal connection with opposite end portions of the frame. The arrangement of the parts is such as to admit of the horns of the driver adapting themselves to the coffins of the runner to obviate throwing said runner out of balance, which would cause it to rake and chuckle, features which it is the purpose of the present invention to obviate. The pivoted members 5 are of like construction and are pivoted to the frame 4, so as to be self-adjusting to the coffins and exert an equal pressure thereon. Each member 5 is provided at its inner end with an eye 6. The inner extremity 7 of each member is of semicircular form and snugly fits a corresponding shoulder 8 at the inner end of the end portion provided with the eye 6, the articulating ends of the members being halved to admit of their overlapping and their top and bottom sides coming about flush. The eye 6 of each member provides ample clearance for the spindle 3 and enables the extremities of the overlapped end portions to articulate, so that movement'imparted to one member is transmitted to the other and both members caused to move in unison.

The frame 4 may be of any construction so long as it provides a support for the pivoted members 5. In the fpreferable construction the frame consists like sections or parts, between which the pivoted members are arranged, said parts being prevented from clamping or binding the pivoted members by longitudinal flanges 11, which are equally divided and provided at the longitudinal edges of the plates or parts comprising said frame. Machine-screws or other fastening means are employed for securing the plates or parts of the frame when fitted together, and bolts or pins 9, passed through registering openings in the end portions of the frame, form pivotsupports for the members 5. An opening 10 is provided centrally of the frame to receive the spindle 3, and said opening is preferably of angular formation to receive a corresponding part of the spindle, whereby both are caused to rotate in the manner and for the purpose well understood.

The members 5 of the driver are mounted to turn upon or with the pins 9 as axes, and their inner ends being jolnted a movement imparted to the outer end of one member is transmitted to and causes the outer end of the other member to move in the same direction, whereby the horns of the driver are caused to bear with equal pressure upon the walls of the coflins 12. I The driving power is applied to the frame 4 from the spindle 3 and is transmitted therefrom through the pivots 9 to the members 5, thence to the runner in the ordinary manner. The eyes 6 are sufficiently large to receive the mill-spindle and admit offree movement of the pivoted members 5 when the driver is self-adapting itself to equalize the application of the driving force to the runner. The longitudinalflanges 11 of the frame 4 are of peculiar formation, having the inner sides thereof formed so as to diverge from a central point, such sides from the points of divergence being straight. By reason of the special formation of the flanges, as above described, the straight side edges of the pivoted members 15 are adapted under certain conditions of service to come into contact with the divergent side portions of the flanges 11, so as to relieve the pivots or pins 9 of strain,-With resultant advantages of obvious import.

Having thus described the inventionpvhat is claimed as new is A driver for the runners of grinding-mills consisting of a frame composed of like sections in spaced relation, each of said sections being provided with abutting longitudinal flanges at its longitudinal edges, fastenings passing through the flanges of the sections of the frame to secure said sections together, the spindle passing through the frame centrally thereof, members pivoted between their ends adjacent to the end portions of said frame and movably mounted in the space between the sections of the frame, the inner ends of the pivoted members being overlapped and adapted to articulate, and having circular openings receiving the spindle, the longitudinal edge portions of the pivoted members being straight and arranged to abut with the inner side ortions of the flanges of the sections of the rame, the inner sides of the flanges of the frame being divergent from a central point and straight, so as to come into contact with the edge portions of the pivoted members, and reinforce the pivots of the latter under certain conditions of service.

In testimony whereof we affix our signatures in presence of two Witnesses.

JOHN L. BROWN. JASPER C. BROWN. l/VILLIAM M. BROl/VN.

Witnesses to signature of John L. Brown:

VIRGIL CLARK, W. A. GREEN.

Witnesses to signatures of Jasper C. and

WVilliam M. Brown:

D. V. SMITH, A. A. BROWN. 

